chore: Remove SSL cert handling - use external reverse proxy

- Nginx now listens on HTTP only (port 80)
- Remove SSL cert volume mounts from docker-compose
- Remove SSL troubleshooting sections
- Update docs to indicate SSL handled by Caddy/reverse proxy
- Simplify nginx.conf to remove HTTPS server block

docs/TROUBLESHOOTING.md

@@ -123,25 +123,6 @@ solana balance
 solana airdrop 2
 ```
 
-### SSL Certificate Errors
-
-**Error:** Browser shows certificate warnings
-
-**Solution:**
-```bash
-# Check certificate
-openssl s_client -connect coop.hobokenchicken.com:443
-
-# Renew Let's Encrypt
-docker-compose -f docker-compose.prod.yml run --rm certbot renew
-
-# Or use self-signed for testing:
-openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
-  -keyout docker/nginx/ssl/key.pem \
-  -out docker/nginx/ssl/cert.pem \
-  -subj '/CN=coop.hobokenchicken.com'
-```
-
 ### CORS Errors in Browser
 
 **Error:** `Access-Control-Allow-Origin` errors
@@ -219,19 +200,6 @@ cd frontend
 npm install next-themes
 ```
 
-### Nginx: SSL Certificate Error
-
-**Error:** `cannot load certificate "/etc/nginx/ssl/cert.pem"`
-
-**Solution:**
-```bash
-mkdir -p docker/nginx/ssl
-openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
-  -keyout docker/nginx/ssl/key.pem \
-  -out docker/nginx/ssl/cert.pem \
-  -subj "/CN=coop.hobokenchicken.com"
-```
-
 ### Docker Compose: Public Directory Not Found
 
 **Error:** `failed to calculate checksum: "/app/frontend/public": not found`